Triple-Mode Substrate Integrated Coaxial Resonator Based Bandpass Filter Featuring Flexible Transmission Zeros and Adjustable Bandwidth

This communication presents substrate integrated coaxial resonator (SICR) based triple-mode bandpass filters designed for K_{u} -band. A self-shielded SICR based third-order filter is realized using two planar coaxial resonators (SICR) embedded in a substrate integrated waveguide cavity (SIW). Merg...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2021-04, Vol.68 (4), p.1223-1227
Main Authors: Krishna, Idury Satya, Mukherjee, Soumava
Format: Article
Language:English
Subjects:
adjustable bandwidth
Band-pass filters
Bandpass filters
Bandwidth
Bandwidths
Cavity resonators
compact
Filtering theory
flexible transmission zeros
Form factors
Insertion loss
Integrated circuit modeling
Mathematical model
Metal strips
Rejection
Selectivity
Strips
Substrate integrated coaxial resonator (SICR)
Substrate integrated waveguides
Substrates
Topology
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Summary:This communication presents substrate integrated coaxial resonator (SICR) based triple-mode bandpass filters designed for K_{u} -band. A self-shielded SICR based third-order filter is realized using two planar coaxial resonators (SICR) embedded in a substrate integrated waveguide cavity (SIW). Merging the TEM based mode of two SICR's with TE 101 mode of SIW significantly enhances the bandwidth in a compact size. A novel topology realized using short circuited metallic via connecting to the top conducting plane through a metal strip demonstrates high degree of flexibility in positioning the transmission zeros to improve the selectivity as well as extend the out-of-band rejection of proposed filter. The three experimental prototypes devised for K_{u} -band with fractional bandwidth more than 23% demonstrate multiple transmission zeros for good selectivity and out-of-band rejection with low insertion loss in a compact form factor.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2020.3035717